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1da177e4 LT |
1 | #ifndef _LINUX_BITOPS_H |
2 | #define _LINUX_BITOPS_H | |
3 | #include <asm/types.h> | |
4 | ||
1da177e4 LT |
5 | /* |
6 | * Include this here because some architectures need generic_ffs/fls in | |
7 | * scope | |
8 | */ | |
9 | #include <asm/bitops.h> | |
10 | ||
3e037454 SN |
11 | #define for_each_bit(bit, addr, size) \ |
12 | for ((bit) = find_first_bit((addr), (size)); \ | |
13 | (bit) < (size); \ | |
14 | (bit) = find_next_bit((addr), (size), (bit) + 1)) | |
15 | ||
16 | ||
1da177e4 LT |
17 | static __inline__ int get_bitmask_order(unsigned int count) |
18 | { | |
19 | int order; | |
20 | ||
21 | order = fls(count); | |
22 | return order; /* We could be slightly more clever with -1 here... */ | |
23 | } | |
24 | ||
94605eff SS |
25 | static __inline__ int get_count_order(unsigned int count) |
26 | { | |
27 | int order; | |
28 | ||
29 | order = fls(count) - 1; | |
30 | if (count & (count - 1)) | |
31 | order++; | |
32 | return order; | |
33 | } | |
34 | ||
1da177e4 LT |
35 | static inline unsigned long hweight_long(unsigned long w) |
36 | { | |
e9bebd6f | 37 | return sizeof(w) == 4 ? hweight32(w) : hweight64(w); |
1da177e4 LT |
38 | } |
39 | ||
45f8bde0 | 40 | /** |
1da177e4 | 41 | * rol32 - rotate a 32-bit value left |
1da177e4 LT |
42 | * @word: value to rotate |
43 | * @shift: bits to roll | |
44 | */ | |
45 | static inline __u32 rol32(__u32 word, unsigned int shift) | |
46 | { | |
47 | return (word << shift) | (word >> (32 - shift)); | |
48 | } | |
49 | ||
45f8bde0 | 50 | /** |
1da177e4 | 51 | * ror32 - rotate a 32-bit value right |
1da177e4 LT |
52 | * @word: value to rotate |
53 | * @shift: bits to roll | |
54 | */ | |
55 | static inline __u32 ror32(__u32 word, unsigned int shift) | |
56 | { | |
57 | return (word >> shift) | (word << (32 - shift)); | |
58 | } | |
59 | ||
962749af AM |
60 | static inline unsigned fls_long(unsigned long l) |
61 | { | |
62 | if (sizeof(l) == 4) | |
63 | return fls(l); | |
64 | return fls64(l); | |
65 | } | |
66 | ||
1da177e4 | 67 | #endif |